. >> this is a highway that unites this area. now, fear has driven away this group that controls the salt trade. they fled to neighboring countries. i ask what they are afraid of. of death, he says. of being killed by soldiers. nearly three weeks ago, just after france intervened, this man saw something he is afraid to speak out openly. the military had arrested three students in islamic dress who had no papers. >> when i got there, the students had their hands tied behind their back. they were on their knees. one of them said, for the sake of god, do not kill me. and not the enemy, i'm just a student. one of the military guys said, don't listen to them. they talk amongst themselves and then one said, fire. they shot all three of them in the chest. they drive to them by their feet and threw them into a well. >> you can see the lines of blood going all the way down. some of this has clearly been pushed down to hide the bodies. the government will investigate what happened but it is clear that several wells hold secrets. at the bus